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20.I have had such a case ______ a boy whispered to his deskmate now and then while I was having lessons.(  )
A.thatB.whereC.whenD.as

分析 我遇到這樣一個情況:當(dāng)我在上課時,一個男孩時而地小聲與同桌說話.

解答 本題是考查定語從句,先行詞是a case,則后面的定語從句的關(guān)系詞有先2種情況;
1.如果定語從句缺少狀語,其關(guān)系詞才必須使用關(guān)系副詞where
2.如果定語從句只缺少主語賓語時,則關(guān)系詞還是使用which/that等
本題定語從句中的句子結(jié)構(gòu)很完整,故使用關(guān)系副詞,因為其后的定語從句如果缺少(地點)狀語in…case(in which),此時in which等同于where.
當(dāng)然這個where意思是"在…情況下",只是一種引申理解的地點狀語,而并非本來意義上即在某個具體地方的地點狀語.故選B.

點評 點評:定語從句的考查主要集中在句子成分的分析.如果從句中缺少主語,賓語,表語定語使用關(guān)系動詞.如果從句很完整,則使用關(guān)系副詞.
修飾先行詞case/point/situation/scene等抽象地點,where的意思相當(dāng)于in which.case

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